CVE-2026-80881
In the Linux kernel, the following vulnerability has been resolved: ocfs2: fix buffer head management in ocfs2_read_blocks() In ocfs2_read_blocks(), caller should't assume that buffer head returned by 'sb_getblk()' is exclusively owned and so 'put_bh()' always drops b_count from 1 to 0. If it is not so, buffer head remains on hold and likely to be returned by the next call to 'sb_getblk()' unchanged - that is, with BH_Uptodate bit set even if it has failed validation previously, thus allowing to insert that buffer head into OCFS2 metadata cache and submit it to upper layers. To avoid such a scenario, BH_Uptodate should be cleared immediately after 'validate()' callback has detected some data inconsistency.
Affected versions
Linux kernel versions
4.4.204,
4.9.204,
4.14.157,
4.19.87,
4.20
and later are affected. Fixed in
5.10.261,
5.15.212,
6.1.178,
6.6.145,
6.12.97,
6.18.40,
7.1.5,
7.2
and their respective stable series.
References
8 totalFrequently asked questions
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What is CVE-2026-80881?
CVE-2026-80881 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 4.4.204 onward and has been patched in 5.10.261, 5.15.212, 6.1.178 and others. CVE-2026-80881 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-80881?
Yes. CVE-2026-80881 has been patched. Fixed versions include 5.10.261, 5.15.212, 6.1.178 and others. If you are running Linux kernel 4.4.204 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-80881 actively exploited?
No. CVE-2026-80881 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.